PECTEN. 179 



published in the ' BibliogTa|)hie de la Franco ' for June 8th, 18'J2, and he is inclined 

 to think that it a})])eared somewhat earlier than Mantell's book. 



AffinUics. — 1\ undulatiis, Nilsson,^ and P. serratas,^ Nilsson, are very closely 

 allied to P. crcfusus, but the examination of a large series of specimens could alone 

 enable us to determine their exact relationships. 



Types. — The types of P. nitidus (from Lewes and Brighton) cannot be found, 

 but the s})ecimen from Gravesend figured by Sowerby is in the British Museum. 

 The types of F. cretosns and 1\ (iraclinoides came from the Upper Senonian of 

 Meudon. I have not seen the types, but specimens from the same locality are in the 

 Wiltshire Collection, and another has been sent to me by M. A. de Grossouvre. 



Didrih'ution. — R. Cuvieii zone of Dover. T. gracilis zone of the Dorset coast and 

 Dover. //. planus zone of the Sussex coast and Dover. M. cor-testudinarium zone of 

 the Sussex coast, Dover, Purley, and Hitchin. M. cor-angninum zone of the Dorset 

 coast, Winchester, Porton (Salisbury), the Sussex coast, St. Mai-garet's, Thanet, 

 Northfieet, Purley, Haling Pit (South Croydon), Bromley. Marsupites zone of 

 the Dorset coast, Winchester, Witherington, the Sussex coast, and Thanet. A, 

 quadratus zone of the Dorset coast, Winchester, East Harnham (Salisbury), and 

 the Sussex coast. B. mucronata zone of the Dorset coast. Clarendon and Alderbury 

 (Salisbury), and Norwich. Chalk of Trimingham. 



Pkcten (CiiLAMYs) Mantelljanus, d' Orblgiu/ , 184-7. Plate XXXIV, tigs, ia,!', 



2, 3 a — c, -1 — G. 



1833. Pecten concentkictjs, 8. Woodward. Geo!. Norfolk, p. 48, pi. v, fi<^s. 



27, 28. 

 1847. — Mantelliantjs, A. d'Orhhjiuj. Pal. Frauc. Terr. Crc't., vol. iii, 



p. 619, pi. ccccxl, figs. 8-11. 

 1850. — _ _ Prodr. dePal., vol. ii, p. 2.51. 



1854. — coNCENTiiicus, /. Morris. Cat. Brit. Foss., ed. 2, p. 176. 

 1870. — Mantellianus, F. J. Pidet and G. Campiche. Foss. Terr. Gi\-t. 



Ste. Croix (Mater. Pal. Suisse, ser. 5), p. 215. 



1 ' Pelrif. Suecaua ' (1827), p. 21, pi. ix, fig. 10 ; Holzapfel, " Mollusk. Aachen. Kreide " (' Palseon- 

 tographica,' vol. xxxv, 1889), p. 235, pi. xxvi, figs. 1, 2 ; Hennig, Revision af Lamell. i Nilsson's 

 ' Petrif. Suecaua ' (1897), p. 48, pi. iii, figs. 9—11 ; Strombeck, ' Zeitsclir. d. deutscb. geol. Gesellscli.,' 

 vol. XV (1863), p. 154; Schroder, ibid., vol. xxxiv (1882), p. 266. 



2 Op. cit. (1827), p. 20, pi. ix, fig. 9 ; Holzapfel, op. cit. (1889), p. 236, pi. xxvi, fig. 16 ; Heuuig, 

 op. cit. (1897), p. 50, pi. iii, fig. 15 ; Stolley, ' Die Kreide Schleswig-Holsteius ' (1892), p. 238 ; Ravn, 

 'Mollusk. i Danmarks Kridtafl.' (1902), p. 89. 



